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Store backup folder Uri in default shared preferences

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and keep using it as long as it continues to be available.
This commit is contained in:
Torsten Grote 2019-06-04 15:19:19 -03:00 committed by Steve Soltys
parent f192e640fb
commit b3c744b872
3 changed files with 62 additions and 6 deletions
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2
app/src/main/java/com/stevesoltys/backup/activity/MainActivity.java
View file

@ -34,7 +34,7 @@ public class MainActivity extends Activity implements View.OnClickListener {
switch (viewId) {
case R.id.create_backup_button:
controller.showChooseFolderActivity(this);
controller.onBackupButtonClicked(this);
break;
case R.id.restore_backup_button:

33
app/src/main/java/com/stevesoltys/backup/activity/MainActivityController.java
View file

@ -25,6 +25,8 @@ import static android.provider.DocumentsContract.buildDocumentUriUsingTree;
import static android.provider.DocumentsContract.createDocument;
import static android.provider.DocumentsContract.getTreeDocumentId;
import static com.stevesoltys.backup.activity.MainActivity.OPEN_DOCUMENT_TREE_REQUEST_CODE;
import static com.stevesoltys.backup.settings.SettingsManager.getBackupFolderUri;
import static com.stevesoltys.backup.settings.SettingsManager.setBackupFolderUri;
/**
* @author Steve Soltys
@ -35,7 +37,22 @@ class MainActivityController {
private static final String DOCUMENT_MIME_TYPE = "application/octet-stream";
private static final String DOCUMENT_SUFFIX = "yyyy-MM-dd_HH_mm_ss";
void showChooseFolderActivity(Activity parent) {
void onBackupButtonClicked(Activity parent) {
Uri folderUri = getBackupFolderUri(parent);
if (folderUri == null) {
showChooseFolderActivity(parent);
} else {
try {
Uri fileUri = createBackupFile(parent.getContentResolver(), folderUri);
showCreateBackupActivity(parent, fileUri);
} catch (IOException e) {
e.printStackTrace();
showChooseFolderActivity(parent);
}
}
}
private void showChooseFolderActivity(Activity parent) {
Intent createDocumentIntent = new Intent(ACTION_OPEN_DOCUMENT_TREE);
createDocumentIntent.addFlags(FLAG_GRANT_PERSISTABLE_URI_PERMISSION |
FLAG_GRANT_READ_URI_PERMISSION | FLAG_GRANT_WRITE_URI_PERMISSION);
@ -77,7 +94,10 @@ class MainActivityController {
(FLAG_GRANT_READ_URI_PERMISSION | FLAG_GRANT_WRITE_URI_PERMISSION);
contentResolver.takePersistableUriPermission(folderUri, takeFlags);
// create backup file in folder
// store backup folder location in settings
setBackupFolderUri(parent, folderUri);
// create a new backup file in folder
Uri fileUri;
try {
fileUri = createBackupFile(contentResolver, folderUri);
@ -88,6 +108,10 @@ class MainActivityController {
return;
}
showCreateBackupActivity(parent, fileUri);
}
private void showCreateBackupActivity(Activity parent, Uri fileUri) {
Intent intent = new Intent(parent, CreateBackupActivity.class);
intent.setData(fileUri);
parent.startActivity(intent);
@ -106,9 +130,14 @@ class MainActivityController {
private Uri createBackupFile(ContentResolver contentResolver, Uri folderUri) throws IOException {
Uri documentUri = buildDocumentUriUsingTree(folderUri, getTreeDocumentId(folderUri));
try {
Uri fileUri = createDocument(contentResolver, documentUri, DOCUMENT_MIME_TYPE, getBackupFileName());
if (fileUri == null) throw new IOException();
return fileUri;
} catch (SecurityException e) {
// happens when folder was deleted and thus Uri permission don't exist anymore
throw new IOException(e);
}
}
private String getBackupFileName() {

27
app/src/main/java/com/stevesoltys/backup/settings/SettingsManager.java Normal file
View file

@ -0,0 +1,27 @@
package com.stevesoltys.backup.settings;
import android.annotation.Nullable;
import android.content.Context;
import android.net.Uri;
import static android.preference.PreferenceManager.getDefaultSharedPreferences;
public class SettingsManager {
private static final String PREF_KEY_BACKUP_URI = "backupUri";
public static void setBackupFolderUri(Context context, Uri uri) {
getDefaultSharedPreferences(context)
.edit()
.putString(PREF_KEY_BACKUP_URI, uri.toString())
.apply();
}
@Nullable
public static Uri getBackupFolderUri(Context context) {
String uriStr = getDefaultSharedPreferences(context).getString(PREF_KEY_BACKUP_URI, null);
if (uriStr == null) return null;
return Uri.parse(uriStr);
}
}